The planes fly about 30 to 100 feet off the ground at speeds of 60 to 100 mph.

The DOT said the aerial approach saves the state money and allows the crew to cover a much larger area.

Seed is best applied in the late winter months so that it will germinate in the spring, the DOT said.

Seeding is expected to be completed in February and March.

--U.S. 20 in Calhoun and Sac counties, from one mile west of Early east to the intersection of U.S. 20 and Iowa 4.

-- Iowa 196 in Sac County, north from Sac County Road D-36 (former U.S. 20) to relocated U.S. 20.

-- U.S. 63 in Bremer County, from Iowa 3 north to Bremer County Road C-38.

Ground crews will be supporting the airplanes in vehicles with amber lights parked along the roadside at the start and finish of each project area, along with posted signs.

The flights are conducted during nice weather days and during daytime hours.

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